Revert "Improve the libstdc++ smart pointer formatters"

This reverts commit r284828, as it causes an infinite loop in
TestPrintStackTraces (funnily enough, only when logging is enabled).

llvm-svn: 285068

1 files changed, 92 insertions, 0 deletions

diff --git a/lldb/source/Plugins/Language/CPlusPlus/LibStdcpp.cpp b/lldb/source/Plugins/Language/CPlusPlus/LibStdcpp.cpp
index 979ca6e..2215b92 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/LibStdcpp.cpp
+++ b/lldb/source/Plugins/Language/CPlusPlus/LibStdcpp.cpp
@@ -63,6 +63,21 @@ private:
   lldb::ValueObjectSP m_pair_sp;
 };
 
+class LibStdcppSharedPtrSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
+public:
+  explicit LibStdcppSharedPtrSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
+
+  size_t CalculateNumChildren() override;
+
+  lldb::ValueObjectSP GetChildAtIndex(size_t idx) override;
+
+  bool Update() override;
+
+  bool MightHaveChildren() override;
+
+  size_t GetIndexOfChildWithName(const ConstString &name) override;
+};
+
 } // end of anonymous namespace
 
 LibstdcppMapIteratorSyntheticFrontEnd::LibstdcppMapIteratorSyntheticFrontEnd(
@@ -336,3 +351,80 @@ bool lldb_private::formatters::LibStdcppWStringSummaryProvider(
   }
   return false;
 }
+
+LibStdcppSharedPtrSyntheticFrontEnd::LibStdcppSharedPtrSyntheticFrontEnd(
+    lldb::ValueObjectSP valobj_sp)
+    : SyntheticChildrenFrontEnd(*valobj_sp) {
+  if (valobj_sp)
+    Update();
+}
+
+size_t LibStdcppSharedPtrSyntheticFrontEnd::CalculateNumChildren() { return 1; }
+
+lldb::ValueObjectSP
+LibStdcppSharedPtrSyntheticFrontEnd::GetChildAtIndex(size_t idx) {
+  ValueObjectSP valobj_sp = m_backend.GetSP();
+  if (!valobj_sp)
+    return lldb::ValueObjectSP();
+
+  if (idx == 0)
+    return valobj_sp->GetChildMemberWithName(ConstString("_M_ptr"), true);
+  else
+    return lldb::ValueObjectSP();
+}
+
+bool LibStdcppSharedPtrSyntheticFrontEnd::Update() { return false; }
+
+bool LibStdcppSharedPtrSyntheticFrontEnd::MightHaveChildren() { return true; }
+
+size_t LibStdcppSharedPtrSyntheticFrontEnd::GetIndexOfChildWithName(
+    const ConstString &name) {
+  if (name == ConstString("_M_ptr"))
+    return 0;
+  return UINT32_MAX;
+}
+
+SyntheticChildrenFrontEnd *
+lldb_private::formatters::LibStdcppSharedPtrSyntheticFrontEndCreator(
+    CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
+  return (valobj_sp ? new LibStdcppSharedPtrSyntheticFrontEnd(valobj_sp)
+                    : nullptr);
+}
+
+bool lldb_private::formatters::LibStdcppSmartPointerSummaryProvider(
+    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
+  ValueObjectSP valobj_sp(valobj.GetNonSyntheticValue());
+  if (!valobj_sp)
+    return false;
+
+  ValueObjectSP ptr_sp(
+      valobj_sp->GetChildMemberWithName(ConstString("_M_ptr"), true));
+  if (!ptr_sp)
+    return false;
+
+  ValueObjectSP usecount_sp(valobj_sp->GetChildAtNamePath(
+      {ConstString("_M_refcount"), ConstString("_M_pi"),
+       ConstString("_M_use_count")}));
+  if (!usecount_sp)
+    return false;
+
+  if (ptr_sp->GetValueAsUnsigned(0) == 0 ||
+      usecount_sp->GetValueAsUnsigned(0) == 0) {
+    stream.Printf("nullptr");
+    return true;
+  }
+
+  Error error;
+  ValueObjectSP pointee_sp = ptr_sp->Dereference(error);
+  if (pointee_sp && error.Success()) {
+    if (pointee_sp->DumpPrintableRepresentation(
+            stream, ValueObject::eValueObjectRepresentationStyleSummary,
+            lldb::eFormatInvalid,
+            ValueObject::ePrintableRepresentationSpecialCasesDisable, false)) {
+      return true;
+    }
+  }
+
+  stream.Printf("ptr = 0x%" PRIx64, ptr_sp->GetValueAsUnsigned(0));
+  return true;
+}